[RF] Check preconditions of RooDataHist::calcTreeIndex in debug builds.
[RF] Check preconditions of RooDataHist::calcTreeIndex in debug builds.

Callers can set the fast argument to retrieve coordinates by index
instead of name. Now, the the assumption that the coordinates have the
same index is checked in debug builds.

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root